![background image](http://html.mh-extra.com/html/kenwood/kdc-bt838u-radio-cd/kdc-bt838u-radio-cd_service-manual_187172007.webp)
7
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No.
Pin Name
I/O
Application
Truth
value table
Processing Operation Description
30
PAN_PAN_DATA
I
Data from panel to system
μ
-com
(Panel
→
System
μ
-com)
UART MAX 500k
31
PAN_SYS_REQ
O
Communication request from system
μ
-com to panel (System
μ
-com
→
Panel)
32
PAN_PAN_REQ
I
Communication request from panel to
system
μ
-com (Panel
→
System
μ
-com)
33
BT_SYS_DATA
O
Data from system
μ
-com to BT module
(System
μ
-com
→
BT module)
33
NC
O
Not used (Models without BT)
Output is
fi
xed to L
34
BT_BT_DATA
I
Data from BT module to system
μ
-com
(BT module
→
System
μ
-com)
34
NC
O
Not used (Models without BT)
Output is
fi
xed to L
35
NC
O
Not used
Output is
fi
xed to L
36
PON_ILL
I/O
Panel LED
FL bias power supply control
H: Power ON
Hi-Z: When panel is detach and power is OFF
37
NC
O
Not used
Output is
fi
xed to L
38
PON_PANEL
I/O
Power supply for panel
μ
-com
Supply FL_VDD
H: Power ON
Hi-Z: When panel is detach and power is OFF
39
ROMCOR_DET
I
ROM correction writing request
H: Can re-write ROM correction (I2C open)
39
EPM
I
EPM input terminal for re-writing
Rewritable when EPM input terminal is “L”
when starting to re-write.
40
CD_MOTOR
O
CD motor control terminal
41
CD_LOE_LIM_SW
I
CD detection terminal (Chucking SW)
H: Loading completed, L: No disc
42
CD_LOS_SW
I
CD loading detection terminal
L: Ejection completed
43
CD_DISC12_SW
I
CD disk detection terminal (12cm)
L: 12cm disc
44
PAN_SC_CON
O
Panel operation control terminal
CE when re-writing system
μ
-com
H: In normal condition, L: Stop the panel
45
CD_LOEJ
I/O CD motor control terminal
46
S_SOC_REQ
I
Communication request from SOC to
system
μ
-com (SOC
→
System
μ
-com)
46
NC
O
Not used (Models without USB)
Output is
fi
xed to L
47
SOC_SSTOP
O
SOC stop terminal
H: Normal, L: Stop SOC
47
CD_SRAMSTB
O
Decoder SRAM STANDBY control
(Models without USB)
L: SRAM standby (6E**)
48
SOC_SRST
O
SOC reset terminal
H: Normal, L: Reset (Bolero)
48
CD_RST
O
CD mechanism
μ
-com RST terminal
H: Normal, L: Reset
49
S_SYS_REQ
O
Communication request from system
μ
-com to SOC (System
μ
-com
→
SOC)
49
CD_CCE
O
Command I/F
CD mechanism chip enable terminal
50
SOC_MUTE
I
DAC mute request
H: Mute request, L: In normal condition
50
CD_MUTE
I
DAC mute request
L: Mute request, H: In normal condition
51
PON_D5V
I/O
For USB /FDC 5V power supply control
terminal
H: ON, Hi-Z: OFF
52
PON
I/O Power supply control terminal
H: ON, Hi-Z: OFF
53
OEM_DISP_DATA I/O External display DATA
External display
53
NC
O
Not used (Models without BT/Models
without OEM_DISP)
Output is
fi
xed to L